Bit of advice

Discuss Bit of advice on the - 'Cat Questions and Answers' forum of I-Love-Cats. We are the place for all talk about 'Bit of advice'. I've got a 10th old cat who was grooming herself earlier when I noticed under her chin a little round baldy patch but it looked red and a little bit ...

I've got a 10th old cat who was grooming herself earlier when I noticed under her chin a little round baldy patch but it looked red and a little bit sore, she had been scratching quite a bit in that one part quite a lot earlier, she's an indoor cat and has never been outside apart from in her cat box. Can any one give me bit of advice as what it could be etc. Thankyou